lpg c/h to electric wet c/h????

scotty1972

Currently got an lpg boiler supplied from metered bulk tank in a 5 year old well insulated house and contemplating an electric wet system on economy 10. Bother put in this system a year ago when house extended replacing storage heating and seems happy with it. Reckons he is paying £130 pcm on econmy 10 with £300 in credit after summer so sounds good. Has anyone on here switched from lpg to wet electric and if so whats the verdict? Look forward to hearing your thoughts good and bad.

dullnote

Hi I too got rid of the LPG boiler and put in a ASHP, only three weeks ago, house is a lot warmer and ecpected to pay £780 a year for all heating, with LPG paid just short of £2k. ASHP should have COP of 2.5, so for straight electricity this would bring it back to just under £2k.

So the onlytime it will pay for you will be when using night rates

LPG 7.4p per KWh
Standard Electric 13.7p per KWh
Eco 7 Electric 4.6p per KWh


Lets say you need 1 KWh of heat to keep the calcs easy and you run the heating for 8 hour at cheep lecy and 4 at normal rates. Using the above LPG would cost 88.9p/ per day per KHw and lecy would cost 91.60p. Threfore better to stay on the LPG.

In short look at how you will use the heating, lecy is very expensive even worse than LPG and I know how expensive that is.

Let us know what you go with, it took me about two years to decide

Dullnote

fishybusiness

Hi,

I've recently done a few calcs comparing oil to LPG, which only part answers your query, but comparing again to electrcity I'd say stay with LPG and ensure your boiler is efficient, in the long run it must be cheaper.

Here is my take on it

Current price of a 47kg bottle is £55 where I live, which is 60p a litre, 8.46p per kWh.

Oil is 60p per litre, 6p per kWh.

Looking at bulk lpg at 48.9p per litre, that's 6.9p per kWh.

The calcs based on current prices show it be 15% more expensive to run than oil.

Bottled LPG comes out at 41% more expensive to run than oil - that's the scary number.

My Eco 7 is 5.51 p per kWh inc vat. Day rate is 10.84p per kWh inc vat, plus I there is a higher rate for a specific number of kWh per day.

During the winter months I can't see how you can save - I should think the 'heat' will need to be on regularly during the day to maintain temperature, which for the most part will mean top rate electricity.

Eco 7 is 34% cheaper than LPG (at 90% efficiency), but wouldn't your heating mainly run during the day, meaning you wouldn't be able to harvest the savings of Eco 7 in the same way storage heaters do.

scotty1972

Ok thanks for that but would be going on economy 10 which has a few hours during daytime but having got the pricing from Scottish Hydro it still seems expensive and not sure if they have increased prices yet!!

Peak units per kWh: 17.30p
Off-Peak units per kWh: 10.02p
Daily Standing Charge (Standard): 26.10p

Please be aware that you can receive a £40.00 annual discount for arranging a direct debit and a £6.00 annual discount for paperless billing. These discounts would be applied directly to your standing charge as a discount.
Off Peak Economy 10 times:
04:30AM - 07:30AM
13:00PM - 16:00PM
20:30PM - 00:30PM

Can anyone give me the conversion constants for volume of lpg and oil to kwh's so I can do my sums more accurately. Currently paying 59pence/litre for lpg.

bobmedley

LPG (propane) gives you 7.1kw per litre, oil 10.2kw - usable kilowattage from either fuel will depend on the efficiency of your boiler.

Take 80% efficiency as a punt and LPG is 5.7kw per litre and oil 8.16. If your boiler is only five years old, then it's more likely to be of a higher efficiency, more like 90% so you will get c6.4kw per litre.

LPG kw's at 59p/litre (assuming 90% efficiency) will be 9.2p, so cheaper than the off peak electricity rate. Oil is c62p/litre at the moment so costs c7.6p a kilowatt, again much cheaper than your off peak rate.

That deal from Scottish Hydro looks very poor - I have just signed with Scottish Power, fixed to 2014 at 10.3p per kwh. You will be running an electric boiler (15 to 20 kw's??) potentially at 17.3p per kw at times and will end up with bills the size of a small planet.

fishybusiness

That deal from Scottish Hydro looks very poor - I have just signed with Scottish Power

I'm also with Scottish Power on one of their 'Internet Only' tarrifs.

frankie

have a look at this:

http://www.nottenergy.com/energy_cost_comparison/energy_comparison_data/september_2012